Motion of planets and satellites

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Question

The radius of the earth is R. For a satellite to appear stationary, it must be placed in orbit around the earth at a height of about (given R = 6380 km) nR above the surface of earth.Then the value of n is

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Solution

For a geostationary satellite, h = 35870 km.
$∴ \frac{h}{R} = \frac{35870}{6380} = 5 .6$

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